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Hyunseung Cho,Jinhee Yang,Jeongwhan Lee,Joohyeon Lee 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.3
The purpose of this study is to compare the heart activity signal sensing performance by textile electrodes (based on size and configuration method) in order to obtain the structural requirements of motion artifact-minimizing textile electrodes suitable for heart activity signal acquisition. Computer embroidery was used to create six types of contact textile electrodes for measuring heart activity by manipulating the electrode size and method of configuration. These electrodes were attached to separate chest belts worn sequentially by eight males in good physical health. Heart activity signals were detected while the subjects stood in a static posture for 60 seconds and while they walked in place at a rate of 80 beats per minute for 60 seconds. The measurements were repeated four times. To collect the heart activity signals, a BIOPAC Systems, Inc. ECG100 electrocardiogram amplifier was used at a sampling rate of 1 ㎑, and the detected raw signals were fed through a bandpass filter. The signal power ratio of the heart activity signal detected by each type of electrode was calculated, and statistical analysis was applied to determine the heart activity signal-acquisition performance of the six electrode configurations. The results of this study indicate that, with regard to the textile electrodes’ configuration method, convex electrodes detected higher-quality signals than flat electrodes; however, no significant performance difference was found in detecting heart activity signals among the three electrode sizes. Among the structural requirements of textile electrodes for heart activity signal acquisition, the electrode configuration method was found to be an important factor that affects heart activity signal sensing in static and dynamic states. Plans for implementing a wearable platform integrating the convex textile electrodes based on this study will be investigated in future studies, along with performance improvements to develop smart clothing technology that can detect high-quality heart activity signals without time or space limitations.
Energy storage and generation through desalination using flow-electrodes capacitive deionization
Hyunseung Lim,Yuncheol Ha,Hye Bin Jung,Pil Sung Jo,Hana Yoon,Do Quyen,Namchul Cho,Chung-Yul Yoo,Younghyun Cho 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Flow electrodes-based capacitive deionization (FCDI) is a highly energy-efficient desalination processcompared to conventional processes, including reverse osmosis and multi-stageflash distillation. Furthermore, it provides a continuous desalinationflow with high salt-removal capacity, whereas CDIusingfixed electrodes requires additional electrode rinsing. In FCDI, salt ions are adsorbed ontoflowcarbon electrodes and stored in the electrode slurry container, which is similar to an electrochemicalflowcapacitor. Therefore, stored ions can generate energy during discharging in FCDI operation. In this study,such energy generation was systematically investigated in terms of the various discharging rates, feedconcentrations, and volume offlow-electrode slurry. We found that the results were correlated with thechanges in the salt concentration of the effluentflow. The discharging current of 50 mA showed thehighest capacity for energy generation out of all the experimental conditions; it recovered around 25% ofthe energy consumed during FCDI desalination. We believe that such energy recovery can greatly reducethe energy consumption needed for FCDI desalination. Such recycling of generated energy would makeFCDI more attractive than other conventional desalination techniques.
조현승(Cho, Hyunseung),고대영(Koh, Daeyoung) 한국기술혁신학회 2011 기술혁신학회지 Vol.14 No.3
본 연구의 목적은 u-health 서비스 수요자를 대상으로 u-health 서비스에 대한 기본적인 ·이용 의향 및 법·개선 방향을 조사함과 동시에 u-health 서비스 활성화 방안에 대한 공급자 및 다양한 관련 이해집단 전문가 의견을 조사하여, 이를 바탕으로 u-health 서비스 활용확산을 위한 정책방향을 도출하는 것이다. 조사 결과, 수요자와 공급자 양측 모두 장기적으로는 u-health 서비스 활용 범위가 크게 확대될 것으로 예상하였지만 현재 u-health 서비스 활용 확산에 여러 가지 걸림돌이 존재하여 개선이 필요한 것으로 나타났다. 소비자 대상 설문 조사에서는 u-health 서비스에 대한 인식 및 신뢰가 아직 충분하지 않은 점 때문에 단기간 내에 전면적인 활용 확산이 어려울 것으로 나타났으며, 전문가 조사에서는 법·제도적 문제가 가장 큰 걸림돌로 나타났다. 따라서 향후 u-health 서비스가 우리나라에서 빠르게 활성화되기 위해서는 u-health 서비스에 대한 인지도를 높여야 하며, 소비자들이 u-health 서비스를 보다 신뢰할 수 있도록 업계와 정부의 노력이 필요하다. 또한 u-health 서비스 관련 법?제도를 조속히 개선하여 공급자가 u-health 서비스를 통하여 안정적으로 수익을 창출할 수 있는 환경을 만들어야 한다. The purpose of this study is to provide policy implications for vitalizing u-health services. We carried out survey of 500 consumers and indepth interview with various experts. Both experts and consumers believe that u-health services will become prevalent in the longrun, although there exist obstacles against vitalization of u-health services. To vitalize u-health service, the Korean government should raise reliability and recognition of u-health service for consumers. Furthermore, law and institution regarding u-health services should be improved to give enough incentives for u-health suppliers and consumers.
동압측정을 통한 반응기 내부 응집상태 모니터링에 관한 기초 실험 연구
조천현(Cheonhyeon Cho),정수화(Soohwa Jeong),안승번(Seungbeon Ahn),이현승(Hyunseung Rhee),오승진(Seungjin Oh),조인혁(Inhyeok Cho),안석기(Seokki Ahn),조현호(Hyeonho Cho),정성묵(Seongmuk Jeong),이은도(Uendo Lee) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
화석연료의 사용을 지양하면서 대체 에너지 자원에 대한 관심이 높아지고 있는 가운데 바이오매스로부터 생산되는 에너지는 재생성과 탄소 중립성으로 인해 많은 관심을 받고 있다. 여기서 유동층 기술은 높은 연소 효율과 낮은 배출 수준으로 인해 산업에서 널리 사용되지만 일반적으로 바이오매스를 연료로 사용할 때 연료에 포함된 높은 알칼리 함량으로 인해 층물질의 응집 및 부식문제를 유발할 수 있다는 단점을 가지고 있다. 특히, 응집의 경우 탈유동화로 인해 연소 효율을 저감 시키며, 심할 경우 장치의 파손을 유발할 수 있기 때문에 이를 미리 파악하여 방지하는 노력이 필요하다. 본 연구에서는 유동층의 응집을 파악할 수 있는 기초연구로서 반응기 내부의 동압을 측정하였다. 측정된 동압을 통해 반응기 내부 상태를 판단하기 위해 시간 영역의 데이터를 주파수 영역의 데이터로 변환하였고 두 가지 방법을 통해 비교하였다. 첫 번째 방법은 고속푸리에변환(fast fourier transform)이며, 두 번째 방법은 전력스펙트럼밀도(power spectrum density)이다. 결과적으로 전력스펙트럼 밀도 방법을 적용하였을 때 실험 조건 변경에 따른 반응기 내부 상태변화를 파악할 수 있었으며, 이를 통해 연속적인 반응기 내부 층 상태를 관찰할 수 있음을 파악하였다.
Hyunseung Yoo,Youngho Cho,Seongmun Hwang 대한골절학회 2019 대한골절학회지 Vol.32 No.1
This paper reports a pseudoaneurysm of the anterior tibial artery after reduction with pointed bone reduction forceps on a spiral fracture of the distal tibia. Most reported injuries occurred at the proximal part of anterior tibial artery during drilling of the proximal tibia. To the best of the authors’ knowledge, injury of the distal part of anterior tibial artery has never been reported. This paper describes a 54-yearold woman with a pseudoaneurysm of the anterior tibial artery clinically detected 11 weeks after the index surgery. This report highlights the need for surgeons to be aware of and careful about this complication during and after surgical intervention.
( Hyunseung Nam ),( Jae Hwa Cho ),( Eun Young Choi ),( Youjin Chang ),( Won-il Choi ),( Jae Joon Hwang ),( Jae Young Moon ),( Kwangha Lee ),( Sei Won Kim ),( Hyung Koo Kang ),( Yun Su Sim ),( Tai Sun 대한결핵 및 호흡기학회 2019 Tuberculosis and Respiratory Diseases Vol.82 No.3
Background: Data on noninvasive ventilation (NIV) use in intensive care units (ICUs) are very limited in South Korea. Methods: A prospective observational study was performed in 20 ICUs of university-affiliated hospitals from June 2017 to February 2018. Adult patients (age>18 years) who were admitted to the ICU and received NIV treatment for acute respiratory failure were included. Results: A total of 156 patients treated with NIV were enrolled (mean age, 71.9±11.6 years). The most common indications for NIV were acute hypercapnic respiratory failure (AHRF, n=89) and post-extubation respiratory failure (n=44). The main device for NIV was an invasive mechanical ventilator with an NIV module (61.5%), and the majority of patients (87.2%) used an oronasal mask. After the exclusion of 32 do-not-resuscitate patients, NIV success rate was 68.5% (85/124); ICU and hospital mortality rates were 8.9% and 15.3%, respectively. However, the success rate was lower in patients with de novo respiratory failure (27.3%) compared to that of patients with AHRF (72.8%) or post-extubation respiratory failure (75.0%). In multivariate analysis, immunocompromised state, de novo respiratory failure, post-NIV (2 hours) respiratory rate, NIV mode (i.e., non-pressure support ventilation mode), and the change of NIV device were significantly associated with a lower success rate of NIV. Conclusion: AHRF and post-extubation respiratory failure were the most common indications for NIV in Korean ICUs. Overall NIV success was achieved in 68.5% of patients, with the lowest rate in patients with de novo respiratory failure.
Cho, Jeonggil,Koo, Jeongseo,Jung, Hyunseung SAGE Publications 2014 Journal of composite materials Vol.48 No.14
<P>In this article, we suggest a theoretical weight-reduction method to partially substitute an alternative light-weight material for a material in a box-type bodyshell with cut-outs using a material selection method. The box-type bodyshell with cut-outs was simplified as an equivalent box-type bodyshell model without cut-outs, which is denoted as an equivalent bodyshell model and has the same vertical stiffness as the case with cut-outs. The thicknesses of the roof and the walls of the equivalent bodyshell model were then determined such that the deflection of the equivalent bodyshell model was equal to the sum of the theoretical deflections of each box-type bodyshell section with cut-outs under a distributed vertical load condition. Next, the material selection method for weight-reduction design was applied to the equivalent bodyshell model to derive the hybrid-type equivalent bodyshell model. Finally, a weight-reduction design of the box-type hybrid bodyshell with cut-outs was derived from the hybrid-type equivalent bodyshell model. To demonstrate this method, we derived a weight-reduction design of the under-frame in the box-type hybrid bodyshell with cut-outs and then compared the finite element simulation results of the derived weight-reduction design with the suggested theoretical results. The comparisons yielded good correlations. The proposed method was useful to reduce the weight of a hybrid bodyshell with cut-outs by changing materials.</P>